Improvement in let-offs for looms



UNITED STATES ,PATENT .OEEIGE DANIEL HUSSEY, OF NASHUA, NEW HAMPSHIRE.

IMPF-IOVEMENT'IN LET-OFFS FOR LOOMS.

Specification forming part of Letters Patent No. 59,024, dated October 23, 1866.

to be fully described in the following speciflcat tion and represented in the accompanying drawings, of which- Figure l is a top view; Fig. 2 a side elevation, and Fig. 3 a rear elevation, of my said invention as applied to the yarn-beam and guide of a loom.

In carrying out such invention I combine with what is usually termed an escapement let-off mechanism a mechanism (positive in its action) whereby the slack of the warps during the process of crossing them, or moving their harnesses, is taken up.

It has been found that the usual spring or weight applied to the warpguide or whiproller (such an application of a weight being represented in the specification of Silas Shepards patent, Reissue No. 1,507 of United States patents) is not, in my opinion, sufficient to be relied on for maintaining the requisite tension on the warps while their harnesses arein move-v ment. I have therefore applied to the warpguide and the escapement mechanism a mechanism which will not only positively perform the function of maintaining the warps at a proper tension while their harnesses are being moved, but will operate to firmly support the warp-guide while the filling is in the act of being beaten up by the lay. Besides performing these effects, the invention will allow the warp-guide to be depressed far enough to cnable the impelling-pawl (to be hereinafter described) to work the detent of the escapement at the proper period for such to take place.

In the drawings, A denotes the frame of a loom; B, the warp-beam or roller 5 C, the warpguide 5 D, the breast-beam; E,the bell-cranked shaft for operating the lay, the two lay-cranks of such shaft being exhibited at b b.

The shaft of the warp-beam B, by means of a train of gears, c d ej', engages with an escapement-wheel, g, provided with a detent, F, having two pallets, h i, and a projection, k, formed and arranged as exhibited in Fig. 2. The said detent is placed directly over the es capement-wheel, and is supported by a pin, l, projecting from the loom-frame. The detent should be capable of being freely turned on the pin.

An impelling-pawl, m, carried by a crankpin, it, arranged eccentrically to the axis of the shaft, and projected from the side of a cam, o, aixed upon such shaft, isfor operating the detent. This pawl is supported in a fork, p, extending down from an arm, r, which projects from one of the journals of the warp guide C, and directly over the periphery of the said cam o.

rod, s, which is to be capable of moving vertically in guides t t, projecting from the loom* frame, and in turnk is supported by a helical spring, u, which encompasses the rod and rests on the lowermost of the guides. A nut, v, screwed on the rods, rests on the upper end of the-spring, and by such spring is borne up against the upper of the guides t t.

The cam ois to be so formed that during its revolution, by its action against and with reference to the arm r, it will cause the following to take place-that is to say, first, the said arm to be raised suiciently to maintain the proper tension on the warps while their har nesses are in movement; second, the said'arm to rest on and be supported by the cam at the into the warps, third, to allow the arm to de* sceud and depress the pawl far enough for it to put in motion the detent or the escapement.

Whenever it may be desirable for the warpbeam to turn and deliver yarn while the operation of weaving cloth is being carried on by the loom, the strain of the warp on the warp-y guide will induce a depression of the arm r sufficient to cause the pawl to move the detent of the escapement-wheel. Such a movement of the detent will be accompanied by a rotary movement of the yarn-beam, whereby yarn will be delivered therefrom.

The cam may be constructed so that while it will not perform the function of supporting the arm of the yarn-guide while the filling is being beaten into the warps, it will perform the other functions, as above explained. In firmly supporting the yarn-guide while the filling is in the act of being beaten into the cloth,

The arm rrests upon the upper end of a v period when the lay is beating the filling close the eseapement mechanism provided with the peiling-pand on, applied to the cranked shaft, said cam, and otherwise constructed as eX- as described, with the arm o andthe escapeplained, except in that feature of the cam by ment mechanism applied to the yarn-guide which it is caused to raise the arm during the and the yarnfbeam, the Whole being to operperiod of movement of the harnesses, is analoate in manner and under circumstances subgous to the invention patented by GeorgeDrastantially as set forth.

per, and described in theUnited States Patent DANIEL HUSSEY. No. 39,469, granted August l1, 1863. Vitnesses:

What I claim as my invention is SAWYER JUNIOR,

The combination ot' the cam 0 and the im- J. P. DODGE. "l 

